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Old 10th September 2004, 10:02 PM   #11
Did it Himself
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Quote:
Originally posted by ainami
The (+) lead of the caps should be connected to the V+ pin? The (+) lead of the second pair of caps should also be connected to the V- pin?
Correct for the first part, but you got the second one the wrong way round. Ground is higher potential than -ve.
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Old 10th September 2004, 11:21 PM   #12
ainami is offline ainami  United States
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I want to thank everyone for their input here. I've made a decision to sell my Sunfire and replace it with an amplifier using a discrete design, such as the B&K. The Sunfire is proving to be much of a challenge, with one thing after another. A standard discrete design will be easier to mod into a high-end amp.
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Old 11th September 2004, 01:08 AM   #13
djk is offline djk
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"The (+) lead of the second pair of caps should also be connected to the V- pin?"

The (+) lead of the second pair of caps should be connected to ground, the (-) lead to the V- pin.
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Old 11th September 2004, 02:10 PM   #14
anatech is offline anatech  Canada
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Hi Aaron,
Listen to both first. Then go. I'm not saying the Sunfire is better, just advice.
-Chris
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Old 11th September 2004, 04:47 PM   #15
markp is offline markp  United States
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The Adcom amps have lots of current capability that the average amp. Thats what gives them the 'slam' that you liked.
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Old 11th September 2004, 06:37 PM   #16
ainami is offline ainami  United States
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The Adcom is a much simpler design. There were only 5 e-caps on each channel (two of them which coupled to the power supply). The sunfire has over 20 caps per channel and lots of opamps. That combined with the highly-regulated power supply makes me understand better how the sunfire sound is very laid-back. The consensus on a lot of opamps is that they will veil the sound somewhat.

The modded Adcom just seemed a lot better all the way around. It had the slam that the sunfire was missing and it was smoother and more accurate with less distortion. The Adcoms are cool and a good value for the money, but it seems that B&K has a little edge over them. I'm also looking at an ATI. I like their build quality, but I don't know if they use opamps or integrated circuits in their design. Their design uses a complete monoblock (per channel) design with only a shared transformer. This is probably good, but there are more rectifiers to replace.
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Old 11th September 2004, 08:14 PM   #17
anatech is offline anatech  Canada
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Aaron,
With a properly designed power supply and amplifier, you will not hear the rectifiers. Trust me on that. But always listen to the product first.
BTW, I was warranty for Adcom also, and many other high end brands. I like Adcom and many others.
-Chris
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Old 11th September 2004, 09:18 PM   #18
markp is offline markp  United States
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The Adcom benefits greatly for a regulated power supply. It is tighter, cleaner mids, and better imaging.
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Old 12th September 2004, 02:49 AM   #19
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Quote:
BTW, I was warranty for Adcom also, and many other high end brands. I like Adcom and many others.
Hi Anatech,
I assume that you would have the service manuals of the Adcoms.
If you do ,would it be possibe for you to email me a copy of the circuit diagram of the Adcom GFA 535 power amp ?
amadhavan-at-yahoo.com ( replace -at- with (@) of course).
Thanks.
Ashok.
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Old 12th September 2004, 01:43 PM   #20
anatech is offline anatech  Canada
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Hi Ashok.
I used to have those manuals, they went with the shop when I sold it. You have no idea how much I miss having all those manuals. If I find a manual I will try to send it.
-Chris
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